This is not using haskell-src-exts, but the Haskell Refactorer has a structure to keep a parallel tree of tokens indexed by SrcSpan, which attempts to allocate comments to the appropriate point.
See https://github.com/alanz/HaRe/blob/master/src/Language/Haskell/Refact/Utils/TokenUtils.hs. It does not make use of the AST itself, so may be usable with haskell-src-exts Alan On Tue, Aug 20, 2013 at 11:19 AM, Niklas Broberg <niklas.brob...@gmail.com>wrote: > Hi Niklas, > > 1) My most desired feature would be a syntax tree that does not pluck >> pluck comments out and make me treat them separately. It looks much >> easier to me to have a fully descriptive tree and (filter . concatMap) / >> traverse them out in some way than getting a list of comments and having >> to insert them back in the right places myself. >> Is that possible? >> > > Sadly not - it's theoretically impossible. The fact that you can put > comments literally wherever, means that it's impossible to treat them as > nodes of the AST. E.g. > > f {- WHERE -} x = -- WOULD > -- THESE > do -- COMMENTS > a {- END -} <- g x -- UP > return {- ? -} a > > What would be theoretically possible is to define a restricted language > that allows comments only in certain well-defined places (cf haddock), and > ignores any others. That's a lot of work though, and it's not clear how big > the gain is. :-\ > > A different solution could be to improve the support, through better > helper functions, for handling a syntax tree and a list of comments > together. That's something I think could be worthwhile. > > >> 2) Have you considered downloading the all-of-Hackage tarball and >> running haskell-src-exts over it to get a benchmark of how much HSE can >> already parse of the Haskell code out there? >> > > Considered, yes. Done, no. Would love to see the results :-). The crew at > OdHac (Roman, Erik, Simon) ensured that the current version handles all of > 'base', which is a good start. > > Cheers, Niklas > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > >
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